水土保持研究2011，Vol.18Issue(5)：87-90,95,5.
不同程度干扰下人工固沙植被区生物结皮对草本植物生长的影响
Influence of Biological Soil Crust Incurred Different Intensities of Disturbance on Herbal Plants in Artificial Fixed-Dunes Area
摘要
Abstract
Biological soil crusts exist in a wide variety of environments around the world.It serves as an important biological factor contributing to the sand fixation.Disturbances are also widely existing phenomena in any ecosystem,especially in arid and semiarid areas in our country,where under the pressure of human population,disturbances such as grazing and trampling have important influences on the ecosystem.Our objective was to learn the influences of different disturbances for biological soil crusts on vascular plants by experiments of imitation disturbances set in artificial fixed-dunes area in Shapotou region.The results showed： the density,average crown,height,root length,and biomass of Bassia dasyphylla grown on three types of biological soil crusts increased significantly with the crusts being slightly disturbed.When the crusts were severely disturbed,the growth of Bassia dasyphylla increased moderately,while the density decreased.Under the circumstance of slight disturbance,the density and growth of Eragrostis minor grown on the moss crusts as well as on the the algae-moss crusts increased slightly and its density did not change significantly.Eragrostis minor grown on the algae crusts did not vary considerably in growth and density.With severe disturbance,Eragrostis minor grown on the moss crusts as well as on the algae-moss crusts increased slightly in height and decreased greatly in density and biomass.The growth and density of Eragrostis minor grown on the algae crusts did not change significantly.The mechanism of the different results of these two herbal plants was analyzed after the crusts were disturbed.关键词
人工固沙植被/生物结皮/干扰/维管束植物Key words
artificial fixed-dunes vegetation/biological soil crust/disturbance/vascular plant分类
资源环境引用本文复制引用
富远年,马风云,刘立超..不同程度干扰下人工固沙植被区生物结皮对草本植物生长的影响[J].水土保持研究,2011,18(5):87-90,95,5.基金项目
国家自然科学基金 （）
